Recuperator construction for a gas turbine engine

Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages

Reexamination Certificate

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C165S170000, C060S039511

Reexamination Certificate

active

07147050

ABSTRACT:
A counter-flow recuperator formed from annular arrays of recuperator core segments. The recuperator core segments are formed from two opposing sheets of fin fold material coined to form a primary surface zone disposed between two flattened manifold zones. Each primary surface zone has undulating corrugations including a uniform, full height central portion and a transition zone disposed between the central portion and one of the manifold zones. Corrugations of the transition zone rise from zero adjacent to the manifold zone and increase along a transition length to full crest height at the central portion. The transition lengths increase in a direction away from an inner edge containing the air inlet so as to equalize air flow to the distal regions of the primary surface zone.

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